William Ryan Foster, MD

Primary specialty

Anesthesiology PhysicianTaxonomy code 207L00000X

License

165371 Issued in CA

Practice address

5301 E Grant Rd
Tucson, AZ 85712-2874

Phone

(520) 324-2030

NPI assigned

May 4, 2018

Last updated

Oct 3, 2025By the provider in NPPES

Sex

Male

Sole proprietor

Yes

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 3

Addresses

Medicare fee-for-service enrollment

Enrolled in AZ

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Specialty

Anesthesiology

Education

New York Medical College, 2018

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Ias Arizona PLLCGroup PAC ID 7517312648, 122 clinicians

Northwest HBP Medical Services LLCGroup PAC ID 8921356536, 278 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Tucson Medical Center Hospital, Tucson, AZ, CCN 030006

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

• Ias Arizona PLLC

  • Anesthesiology Physician
  • Tucson, AZ
  • NPI 1689359747

  Single Specialty

  Medicare reassignment Care Compare group NPD
• Northwest HBP Medical Services LLC

  • Emergency Medicine Physician
  • Tucson, AZ
  • NPI 1407353006

  Single Specialty

  Medicare reassignment Care Compare group NPD

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

• Tucson Medical Center

  • General Acute Care Hospital
  • Tucson, AZ
  • NPI 1174512792
  Care Compare affiliation

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1525392000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1759449600000",
    "number": "1093204174",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "3510 N CRAYCROFT RD APT 6203",
            "city": "TUCSON",
            "state": "AZ",
            "postal_code": "857187287",
            "telephone_number": "425-829-8895"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "5301 E GRANT RD",
            "city": "TUCSON",
            "state": "AZ",
            "postal_code": "857122874",
            "telephone_number": "520-324-2030"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "FOSTER",
        "first_name": "WILLIAM",
        "middle_name": "RYAN",
        "credential": "MD",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2018-05-04",
        "last_updated": "2025-10-03",
        "certification_date": "2025-10-03",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207L00000X",
            "taxonomy_group": "",
            "desc": "Anesthesiology",
            "state": "CA",
            "license": "165371",
            "primary": true
        },
        {
            "code": "207L00000X",
            "taxonomy_group": "",
            "desc": "Anesthesiology",
            "state": "AZ",
            "license": "65774",
            "primary": false
        },
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "AZ",
            "license": "R76655",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Janet Foster
• Joshua Foster
• Marcia Foster
• Milvian Michille Foster
• Russell W Foster, MSN, ARNP, NNP-BC
• Michelle Kay Foth, MD
• Clementine Marguerite Foucher, MD
• Foulk-Manela, PC
• Bryan Richard Foulk, DMD
• Sara Elizabeth Foulk, MS CCC SLP

• Anesthesiology Physician in Tucson, AZ
• Providers in Tucson, AZ by specialty
• Anesthesiology Physician in Arizona

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Oct 3, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.